Apparatus for making tubular sand cores.



No. 887,757: PATENTED MAY 19, 1908.

w. D. BERRY.

APPARATUS FOR MAKING TUBULAR SAND GORES.

APPLICATION FILED JUNE 12, 1907.

2 SHEETS-SHEET 1 WITNESSES. INVENTOR.

No. 887,757. PATENTED MAY 19, 1908. W. D. BERRY.

APPARATUS FOR MAKING TUBULAR SAND GORES.

APPLICATION FILED JUNE 12, 1907.

2 SHEETS-SHEET 2 WW /l 4 WITNESSES. awivfiiem VE 6-2 C Z774 WILLIAM D.BERRY, OF NEW BRIGHTON, PENNSYLVANIA.

APiARATUS FOR MAKING TUBULAR SAND COR/ES.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed June 12, 1907. Serial No. 378,633.

To all whom it may concern:

Be it known that I, WILLIAM D. BERRY, a resident of New Brighton, in thecounty of Beaver and State of Pennsylvania, have invented anew anduseful Improvement in Apparatus for Making Tubular Sand Cores,

. which is adapted for machine jarring so as to the Wire rings used.

dispense with hand labor Which'is ordinarily employed for this purposeand to greatly .expedite the making of such cores as well as getting amore uniform product.

The invention comprises the construction and arrangement of partshereinafter described and claimed.

In the accompanying drawings Fi ure 1 is a vertical sectional viewthrough t e apparatus showing a portion \of the jarring machine; Fig. 2is a vertical section showing a portion of the molding parts; Fig. 3 isa plan view of the shell core plate; Fig. 4 is a ottom view of a portionthereof; Fig. 5 is a sectional view of one of the bushings em-- ployed;and Fig. 6 is a plan view of one of Any suitable jarring mechanism maybe used in con unction with my improvedapparatus. In Fig. 1 a portion ofa jarring machine is shown, this comprising theframe 1 on which themachine plate 2 is mounted for vertical movement. This plate may beactuated by any suitable mechanism, the drawings showing a powercylinder 3 for lifting the same and permitting it to drop upon an anvil4.

In using my apparatus I place upon the machine plate a suitable mandrelplate 6 preferably provided with a central opening 7 for receiving athreaded stud 8 to be used in securing the central pattern or mandrel 9to the plate, by inserting in the mandrel a threaded bushing 10 whichmay be secured to the mandrel by any suitable means, such as screws 11.This mandrel will, of course, be made'of a shape to conform to the interior of the ring or shell core. Also resting on the mold bottom plate 6and fitting 1 around the lower portion of the mandrel 9 is a shellcorering 12, or shell core late as it is called, upon which the core ox13 is arranged to rest, the shell core plate being rovided with anannular shoulder 14 overw 'ch a downwardly projecting lip 15 on the corebox projects in order to hold the core box centered. The core box ismade of a form to suit the exterior of the ring or shell core, thelatter being formed in the annular space between the mandrel and thecore box.

The shell core plate 12 is provided with the holes 16 for receiving thelower ends of anchoring members 17 which are embedded in the core, andin order to adapt said core plate to the making of cores of varioussizes it is 'a disk 18 to which is connected a U shaped spring 19extending down into the hole and having its endsentering depressions orslots 20 out in the lower face of the plate so as to revent the diskfrom getting out of place, but leavin it easily movable.

"The anc oring members 17 are also preferably used as vents to permittheescape of gases, while casting and are therefore formed of tubesprovided with perforations 21 and are adapted to have then upper endsclosed by any suitable means, such as the disks 22. These anchors notonly serve to center the core in the mold and to secure the core to thebase plate of the flask when casting so as to prevent the core fromrising due to the weight of the molten metal being poured in, but alsoserve as supports for the core and hold it in proper position in themold cavity, as well as providing means for adjusting the position ofthe core vertically in the mold. The particular core shown is for use incast ing cored out water cooled twyers, the anchors passing out at thepoints. where the holes are made through the wall of the larger end ofthe twyer.

The core remains on the core plate 12 until the core is baked and strongenough to be handled, and since the sand expands in the process ofbaking provision vmust be made to relieve that portion ofthe sand, shownat 23,

which extends down into the holes 16 in the core plate. This is done byproviding bushings 24 which fit loosely in the holes in the o enings inthe bushings 24 are flaring, as

I part of the mold.

I strengthening members so constructed as to adjust its diameter withthe sand in des own, so as to form the part 23 of the core tapering,which provides for adjustment of the core vertically in the mold, saidconical parts 23 ressing down into the sand of the drag. This also givesa tight joint at this In case an inwardly projecting flange is to beformed around a hole a removable collar '25 is placed on the core plate12 and around the u perend of the bushing 24. The anchor embers 17 attheir lower ends will be provided with suitable means for securing thesame to the bottom plate of the flask, the drawings showing for thispurpose inte riorly threaded sockets 26 secured to the threaded lowerends of the anchors and adapted to receive nipples orother securingmeans. The anchors 17 and sockets 26 do not, however, extend below thebottom face of the core plate 12, so .that the molded core can becarried by means of said ring and supported thereon in the oven whilebaking.

, To" assist in strengthening the shell like core and prevent the sandfrom breaking be-.

fore baking, I provide one or more horizontal scending over theconically arran ed anchoring members, and not spring ack when takenfrom..the mandrel. Ordinary rings have been used for this purpose butunder the load of sand being packed down into the mold these rings wereforced to slide down on the tapering anchors, thus partiallystraightening the portion of the rings be tween the anchors. Theconsequence is that the metal of the ring is put under tension and whenthe core is taken from the mandrel they tend to resume their normal vcircular shape with the result of fracturing the sand. To avoid this Imake the rings 30 expansible, such as over-lapping the ends of the ringsfor a considerable distance and providing the ends with eyes 31surrounding the ring proper so that under pressure the rings can expand,the eyes merely sliding over the wire as will be readily understood. Theconsequence is that the rings merely expand when sliding down instead ofbeing put under strain.

In conjunction with the apparatus I use an ordinary reservoir 33 and acenter cone 34 laced on top of the 'corebox and man dre respectively. Ifdesired, the mandrel mandre l plate plate 6 may be dispensed with andthe machine late used for this purpose.

\ In the use of the apparatus the mandrel 9 is first secured to'themandrel late 6'after which the core late 12 is placed around the mandreland t e anchor members 17 with bushings 24 surrounding their lower endsinserted in four of the holes 16 of the core plate, the remaining holesbeing closed by the disks 18. The tops of the tubular anchors 17 areclosed by the disks 22 and the core box is then set upon the core plate12 after which the whole is brought underneath the reservoir and sand isfed down in the usual way. The machine is then put in operation, thusjarring the sand down into the space between the mandrel and core boxand also down into the flaring upward ends of the bushings 24. When thejarring is completed the sand is out 0d at the top of the core box, thecore box removed and the core raised by means of the core plate 12,thereby stri ping the core from the mandrel. The bushings 24 are thenremoved and the core baked.

Various changes can be made in the de-" vices described withoutdeparting from the s irit of my invention or the terms of the c aimsherein made.

What I claim is:

1. Core molding apparatus comprising a mandrel plate provided withmandrel securing means, an annularshell core plate or ring seating onsaid mandrel late and surround-' ing the base of the man rel and a corebox seating on said core plate.

2. Core molding apparatus comprising a rovided with a threaded boss forsecuring t e mandrel, an annular shell core plate or ring resting on themandrel plate and surrounding the base of the mandreland rovided withanchor receiving open-' ings,'.and a core box seating on the core p ate.

3i'Core molding apparatus comprising a mandrel plate, a shell core plateresting on said mandrel plate and provided with a plurality of sets ofanchor receiving openings,

each' -set being a diflerent distance from the center than the other,sets, closures for said openings, and a core box seating on said coreplate.

4. Core molding apparatus comprising a mandrel plate, an annular she'llcore plate resting on the mandrel plate and surrounding the base of themandrel and provided with anchor receiving openings, and a core boxseating on said core plate.

5. Core molding apparatus, comprising a core plate provided with aplurality of sets of anchor receiving openings, each set being adifferent distance from the center than the other sets, closures forsaid openings, and a core box seating on said core plate.

6. Core molding ap aratus comprising a core plate provided with aplurality of sets of anchor receiving openings, closure disks for saidopenings provided with springs projecting down into the openings andengaging the same frictionally, and a core box seating on said plate.

7. Core molding apparatus comprising a core plate provided with anchorreceiving openings, removable bushings in said openings fitting thelower ends of the anchors, and a core box seated on said core plate.

8. Core molding apparatus comprising a core plate provided withopenings, ushings in said openings for receiving the lower ends ofanchoring members and flaring upwardly, and a core box seating on saidcore plate.

9. Core molding apparatus comprising a core plate provided with anchorreceiving openings, removable bushings fitting in said openings andflaring upwardly, a removable collar or ring seated on the core lateandsurrounding the upper end of a bus 'ng,'and a core box seating on saidcore plate.

10. Core molding apparatus comprising a core plate provided with anchorreceiving openings, anchor members projecting into said 0 enin s but notextending below the lower ace 0 the plate and provided on their lowerends with threaded members, and a core box seating on said core plate.

11. Core molding apparatus comprising a core plate provided with anchorreceiving openings, anchors projecting down into said openings, but notextending below the lower face of the late threaded sockets on the lowerends 0 said anchors, and a core box seating on said core plate.

' 12. Core molding apparatus comprising a core plate provided withanchor receivlng openings, perforated pipes projecting into saidopenings and provided with anc oring members at their lowerends, andclosures for the tops of said pipes.

13. Core molding apparatus comprising a core plate provided withopenings, perforated pipes provided with threaded sockets at then endsand. projecting into said openin s, an d closures for the upper ends ofthe pipes.

'14. Core molding apparatus comprising a core plate provided with anchorreceiving openings, anchors projecting down into said openings, andexpansible rings surrounding said anchors:

removable bushings in said opemngs,

15. Core molding apparatus comprising a 3 core plate provided withanchor receiving openings, anchors projecting down into said 0 enings,and rings surrounding said anciiors, said rings having overla ping endsand provided on their ends wit eyes surrounding the ring proper.

In testimony whereof, I the said WILLIAM D. BERRY have hereunto set myhand.

WILLIAM D. BERRY. Witnesses:

ROBERT C. TOTTEN, JOHN F. WILL.

